53) During one cardiac cycle the ventricles spend most of their time in A) systole.B) contraction.C) fibrillation.D) diastole.E) None of the answers are correct.Answer:
D54) The chambers of the heart empty during
C55) During their period of systole, the inner volume of the atrial chambers
B56) The most important factor in ensuring that blood moves in correct order through the heart is (the)
D57) In terms of time, at rest one cardiac cycle lastsA) about 1.5 seconds.B) a little under 1 second.C) 5 seconds.D) about a half second.E) None of the answers are correct.Answer:
B58) Which of the following conditions would cause the amount of blood entering the ascending aorta with each contraction of the heart to increase?